Carburetor



Dec. 25, 1928. 1,696,711

F. c. GIVENS CARBURETOR Filed Sept. 15, 1926 //v VENTQP .F. C. Givens (ATTORNEYS er a Patented Dec. 25, 1928.

UNITED STATES PATENT OFFICE.

FRANK C. GIVENS, OF TUOLUMNE, CALIFORNIA; CLARA B. GIVENS ADMINISTRATRIX OF SAID FRANK G. GIVENS, DEGEASED.

CARBURETOR.

7 Application filed September 13, 1926. Serial No. 135,242.

This invention relates to an improved carburetor and has for an object to provide a construction wherein the liquid fuel is caused to change direction while in the presence or" moving air before it enters a combustion chamber.

Another object of the invention is to provide an improved carburetor wherein control valves are arranged at the air inlet and air and fuel outlet.

A further object of the invention is to provide a carburetor wherein the float operates a valve for preventing an excess supply of fuel liquid to the carburetor when the same is being supplied under gravity.

" by numerals, 1 indicates the bowl of a carburetor and 2 the mixing chamber which is adapted to be connected at one end with means for utilizing the explosive mixture supplied by the carburetor. The end 3 is adapted to be connected with the intake manifold of an internal combustion engine or to be otherwise suitably connected with the cylinders of the engine so that when the engine is turned over or is operating, explosive'mixture will be drawn from the mixing cham her 2. The mixing chamber 2 is provided with tubular members 4 and 5 merging into a central section 6 which preferably has an integral central post 7. The liquid from the bowl 1 is discharged from the pipe 8 into the mixing chamber 2 near the post 7 and in fact, in such a manner as to cause some of it to strike the post, though most of which will be immediately taken up by the air passing through the tubular section 5. Butterfly valves 9 and 10 are provided in the tubular sections 4 and 5, said valves being controlled by suitable rods whereby they may be opened and closed as desired. It will be noted that the valve 10 regulates the amount of air passing into the mixing chamber while valve 9 regulates the outflow of explosive mixture. It is, of course, evident that if valve 10 is open and valve 9 is closed or almost closed, only a small amount of air may enter.

The post 7 merges into an auxiliary post 11,

which has a pointed end 13 and a threaded section 14.. This rod acts as a needle valve and may be readily adjusted by the thumb,

member 15 connected to the rod at the outer end. The hollow post 11 is provided with passage-ways 16 and 17 near the bottom of the bowl or reservoir 1.

When the needle valve or rod 12 is in the position shown in Figure 1, no liquid can flow from the reservoir or bowl 1. When the pointed end 13 is unseated more or less, some of the liquid may flow through the opening 18 into the pipe 19 and through the va rious sections of this pipe through pipe 8 where it is discharged into the mixing ch amber which mixes with the air before entering the intake manifold of the engine. It will be noted that the upper edge of the bowl 1 is seated in an annular groove 20 while the lower edge is clamped by the nut 21 screwed onto the lower end of post 11 whereby the bowl is firmly clamped in position, the ar rangement producing an air-tight connection. A gasket 22 is arranged adjacent nut 21 so as to prevent any leakage at this point. A float of cork or other material 23 is provided in the bowl 1 and is swingably supported by a hinge structure 24. A rod 25 is connected to float 23, said rod carrying a. valve member 26 adapted to be moved against the seat 27 which forms an enlargement of pipe 28.

When the liquid 29 is lowered, float 23 will naturally swing downwardly under the action of gravity and move the valve member 26 away from its seat whereby pipe 28 is open and liquid may pass therethrough into the bowl 1. Pipe 28 is connected with a supply pipe 30 which is connected to a suitable supply reservoir 30 arranged at any desired point, as for instance, the rear of an automobile. Sometimes the tank or reservoir 31 is arranged. to cause the liquid fuel to flow by gravity through'pipe 30 and from thence into bowl 1. WVhen this arrangement is used, the float 23 is very important as it causes the closing of valve 26 and thus limiting the amount of fuel in the bowl. Where the bowl 1 is supplied through the action of suction, the liquid fuel will flow through pipes 30 and 28 when a suflicient rarefaction is provided in the bowl 1, said rarefaction being produced by the'suction of the cylinders of the engine to which; the carburetor is, secured: Ordinarily, when the parts are inthe position shown in Flgure 2, the air 111 the upper part 01? thebowl isunder atmospheric pressure and. the valve 26 is slightly open so that when the.

engine is turned over or started, liquid fuel may be readily drawn from the carbuagetor and as the same is drawn from the carburetor suction will be produced which will cause a new supply of liquid fuel to be drawn into the bowl l. Azc1-1p32 is provided Which is suppliedwwith ai-vallve 33, said valvein turn being-connected avithbowl :1 preferably above the float whereby a. supply of liquid :tuel may be inserted into the carburetor \vheneverdesired, as for instance, when the carburetor is first-installed.

As the-engine operates it Will' produce a ra-refaet-ion oi suction in the mixing chamber 2 so that air is drawn therein and also liquidfuel which xvi-llquic-kly minvvith the air and will divideas it passes the post 7. This din viding' of: the sprayed liquid EI-HClHlSO the air, causes an independent carburetion oneach side of the post 7 =an-d later this independently carbureted fuel is mixed before it passes valve 9 whereby avery eilieient carbu-retionis produced beforeth'e mixtureenters the intake manifold oi the engine to Whiclrthe carbu retor is connected The mixture may i be readily changed at any time-by adjusting the rodor need l'e valve 12. Also, a slight variation in mixture may be provided by a proper manipulation of valves '9 and 10 If valve 10 is shut o ii completely soith at verylittle air enters, the engine Will draw: liquid fuel. in the usual manner Which Will IDlX WllZh the small amount of air passing valve 10 and will thereby produce averyrich mixture. Ifthe valve 10 is open fully and the valve 9 almost closed, substantially a reverse action Will be produced and the mixture Will be very poor.

l l hat I claim is:

A carburetor, comprising means forming a mixing chamber formedwith acentral hollmvpost, an inlet at one end and an outletat the opposite end, said. means being. also.

formed with a tubular extension projecting at right angles to said mixing chamber, said tubular extension being in free communica-- tion with saidlrolel'oiv post, said tubular extension having-apertures in its sides .neartlie end thereof opposite said hollmvrpost anda valve seat surrounding a discharge opening. near said apertures, ahandoperated valve extendin through said hollow postfand into, said tubuiarextension for co actingwith said. seat to controlthe flow ofifuel'passingiout through said dischargeopening, means forms ing a float chamber positioned to. be in communication with said v apertures, tubnlar means forming apassage way from said-dis: charge opening to said mixing chamber, and valves co-acting'with said inletand said outlet for controlling theentrance o-fiair into, the mixing chamber and the discharge of explosive mixture from the. mixing chamber.

FRANK C. GIVENS 

